A planar slow-wave structure of ridged microstrip line
A technology of slow wave structure and microstrip, which is applied in the direction of the circuit components of the transit time type electron tube, can solve the problems of high interaction coupling impedance, small power capacity, narrow bandwidth, etc., and achieve high coupling impedance, high coupling impedance, Processing simple effect
Inactive Publication Date: 2016-01-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
The advantage of the helical slow-wave structure is flat dispersion characteristics and wide operating frequency, and it has been widely used in traveling wave tubes; but the heat dissipation capacity of the helix is limited, and the average output power is not high, especially when the helical traveling wave tube When the operating frequency rises to the millimeter wave band, the lateral dimension of the helix is very small, making it more difficult to dissipate heat, and its power capacity is smaller, and because the helix itself is a three-dimensional structure, the processing accuracy is difficult to meet the requirements when the size is small
The coupling cavity is an all-metal slow-wave structure, which has a strong heat dissipation capability. At the same time, the coupling cavity has high interaction coupling impedance and high interaction efficiency, but its bandwidth is narrow, and its application is limited.
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[0030] The size parameters of the ridged microstrip meander slow-wave structure provided by the present invention are: the height of the metal rectangular shell is d, the thickness of the rectangular dielectric layer is h, the width of the metal microstrip line is w, the thickness is t, and the length is b, the width of the metal ridge is w 1 , with a thickness of t 1 , the length is l, the period of the slow wave structure is p, and the transverse width is a. Set structural dimensions (mm) and materials used: a=1.48, d=0.8, t=0.01, w=0.02, p=0.38, b=0.74, w 1 =0.02,t 1 =0.01, h=0.25, l=0.74. Take the metal wire as a sinusoidal microstrip metal wire structure, the material of the sinusoidal microstrip line is oxygen-free copper, and the conductivity in the Ka band is set to 3.5×10 7 ; The material of the rectangular dielectric layer is alumina, and the relative permittivity is 9.8; the material of the shell is copper, and the conductivity is also set to 3.5×10 7 .
[003...
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The invention discloses a ridged microstrip meander slow-wave structure, which includes a metal rectangular shell 1 and a rectangular dielectric layer 3, and also includes a ridged microstrip meander 2 composed of ridges and microstrip meanders, the rectangular dielectric Layers are set in the metal rectangular shell, the ridged microstrip meander line 2 is located on the dielectric layer 3, the ridged microstrip meander line 2 and the dielectric layer 3 are arranged in the metal rectangular shell 1, the microstrip meander line is composed of multi-segment shapes and Microstrip meander metal wires with the same size are connected end to end to form a meander structure. The present invention can use ribbon-shaped electron beams to interact with electromagnetic waves, and has higher coupling impedance and higher interaction efficiency than the same kind of microstrip zigzag lines without ridges at the same size, and can meet the requirement of millimeter wave power for equipment systems. Amplifier requirements in terms of operating bandwidth, operating voltage, output power, weight and volume.
Description
technical field [0001] The invention belongs to the technical field of microwave vacuum electronics, and relates to a slow wave structure in a traveling wave amplifier or an oscillator in the technical field, in particular to a ridged microstrip zigzag line slow wave structure. Background technique [0002] Traveling wave tube is the most important type of microwave and millimeter wave source in the field of vacuum electronics. It has the characteristics of high power, high gain, wide frequency band and long life. It is widely used in millimeter wave radar, guidance, communication, microwave remote sensing and radiation measurement. And other fields, its performance directly determines the level of equipment. [0003] The composition of the traveling wave tube is relatively complicated. Usually we divide it into an electron gun that provides electron beams, a focusing system that constrains and focuses the electron beams, a slow wave system, an input and output device for in...
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IPC IPC(8): H01J23/24
Inventor 魏彦玉程兆亮王森林廖雷殷海荣段兆云巩华荣唐涛宫玉彬王文祥
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA